<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
    //整形: integer 浮点数；float
    let score = '98.2';
// 1.字符串转化为number
score = parseFloat(score);
// score = parseint(score);
console.log(score);
console.log(typeof score);
// 2.not a number
score =  parseInt('剑豪');
console.log(score);

// 3.强制转化为number
let  age = Number('123');
console.log(typeof age);
</script>
</body>
</html>